is.numeric() is generic. So grid could include
is.numeric.unit <- function(x) FALSE
and register it in its namespace. Or Bert could define it in his
application.
On Thu, 25 Feb 2010, gunter.ber...@gene.com wrote:
Paul:
I figured that would be the problem.
I encountered the issue when I tries to check arguments in a validDetails
method for a grob.
Could one substitute the following function in the grid namespace?
is.numeric <- function(x)if(is.unit(x))TRUE else is.numeric(x)
(or make the first clause FALSE)
Obviously, messing around like this might be dangerous -- or at least would
compromise execution speed.
Cheers,
Bert
Bert Gunter
Genentech Nonclinical Biostatistics
-----Original Message-----
From: paul murrell [mailto:r-b...@r-project.org]
Sent: Wednesday, February 24, 2010 4:22 PM
To: gunter.ber...@gene.com
Subject: Re: grid unit bug? (PR#14220)
The following seems to me to be at least a perverse trap, if not an =
outright
bug:
is.numeric(unit(1,"npc"))
[1] TRUE
is.numeric(1*unit(1,"npc"))
[1] FALSE
is.numeric(unit(0,"npc") +unit(1,"npc"))
[1] FALSE
...etc.
i.e. is.numeric() appears to be TRUE for class "unit" but false for =
class
("unit.arithmetic" "unit" ). Seems to me it ought to b the same for =
both.
These results simply reflect the underlying data structures (simple "unit"s
are
just numeric vectors, but more complex "unit.arithmetic"s are lists). I
don't
see how I can "hide" the numeric-ness of simple units (just like there's no
way
to stop a "ts" object like 'Nile' from satisfying is.numeric()). I could
re-implement simple units as lists, but (apart from the work involved) that
would be (even) less efficient.
1. Is there a situation where this causes a problem?
2. Do you have a possible "fix" in mind?
Paul
Bert Gunter
Genentech Nonclinical Biostatistics
(FWIW, I think grid graphics is brilliant!)
This was R version 2.11.0dev for Windows btw (not that it makes a
difference):
sessionInfo()
R version 2.11.0 Under development (unstable) (2010-02-15 r51142)=20
i386-pc-mingw32=20
locale:
[1] LC_COLLATE=3DEnglish_United States.1252=20
[2] LC_CTYPE=3DEnglish_United States.1252 =20
[3] LC_MONETARY=3DEnglish_United States.1252
[4] LC_NUMERIC=3DC =20
[5] LC_TIME=3DEnglish_United States.1252 =20
attached base packages:
[1] datasets splines grid tcltk stats graphics =
grDevices
[8] utils methods base =20
other attached packages:
[1] TinnR_1.0.3 R2HTML_1.59-1 Hmisc_3.7-0 survival_2.35-8
[5] svSocket_0.9-48 lattice_0.18-3 MASS_7.3-5 =20
loaded via a namespace (and not attached):
[1] cluster_1.12.1 svMisc_0.9-56
=A0
=A0
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
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